Adoption of ASU 2014-09, "Revenue from Contracts with Customers" – Transaction Price Allocated to Remaining Performance Obligations (Details) - USD ($) $ in Thousands	Jul. 01, 2018	Jan. 01, 2018
Performance Obligations by Period
Total deferred revenue	$ 33,555	$ 30,574
Franchise royalties and fees
Performance Obligations by Period
Less than 1 Year	2,426
1-2 Years	2,179
2-3 Years	1,948
3-4 Years	1,732
4-5 Years	1,503
Thereafter	3,795
Total deferred revenue	13,583
Area development fees
Performance Obligations by Period
Total deferred revenue	4,200
Customer loyalty program
Performance Obligations by Period
Total deferred revenue	$ 15,800	$ 14,724